Two-particle Berry phase mechanism for Dirac and Majorana Kramers pairs of corner modes

Tan, Yi1,2,3; Huang, Zhi-Hao1,2,3; Liu, Xiong-Jun1,2,3,4,5,6

2022-01-13

10.1103/PhysRevB.105.L041105

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

We uncover an alternative two-particle Berry phase mechanism to realize exotic corner modes in second-order topological insulators (TIs) and topological superconductors (TSCs) with time-reversal symmetry. We show that the nontrivial pseudospin textures of edge states in two different types of two-dimensional TIs give rise to different two-particle geometric phases in the particle-hole and particle-particle channels, respectively, for which the edge mass domain walls or intrinsic pi junctions emerge across corners when an external magnetic field or s-wave superconductivity is considered, hosting Dirac or Majorana corner modes. Remarkably, with this mechanism we predict the Majorana Kramers pair of corner modes by directly coupling the edge of a type-II time-reversal invariant TI to a uniform s-wave SC, in sharp contrast to previous proposals which rely on unconventional SC pairing or a complex setting for a fine-tuned SC pi junction. We find Au/GaAs(111) to be a realistic material candidate for realizing such a Majorana Kramers pair of corner modes.

SCI ; EI

英语

通讯

National Key R&D Program of China[2021YFA1400900] ; National Natural Science Foundation of China[11825401,11921005] ; Strategic Priority Research Program of Chinese Academy of Science[XDB28000000]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000752562000002

AMER PHYSICAL SOC

20220411535795

Fruits ; Shear waves ; Textures

Agricultural Products:821.4 ; Mechanics:931.1

PHYSICS

Web of Science

1.Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
3.Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
4.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China
5.Southern Univ Sci & Technol, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Tan, Yi,Huang, Zhi-Hao,Liu, Xiong-Jun. Two-particle Berry phase mechanism for Dirac and Majorana Kramers pairs of corner modes[J]. PHYSICAL REVIEW B,2022,105(4).

Tan, Yi,Huang, Zhi-Hao,&Liu, Xiong-Jun.(2022).Two-particle Berry phase mechanism for Dirac and Majorana Kramers pairs of corner modes.PHYSICAL REVIEW B,105(4).

Tan, Yi,et al."Two-particle Berry phase mechanism for Dirac and Majorana Kramers pairs of corner modes".PHYSICAL REVIEW B 105.4(2022).